Achievements
Complete each achievement to get the allotted gamerscore:

Amy Rose (10) - Become friends with Amy.
Metal Sonic (15) - Get all 130 Emblems by playing Sonic Adventure DX.
Metal Sonic Master (15) - Get Level A on all the Action Stages by using Metal Sonic.
Miles "Tails" Prower (10) - Become friends with Tails.
Mission All Accomplished (20) - Clear all 60 missions.
Big the Cat (10) - Become friends with Big.
Chao's Best Friend (20) - Get all Emblems of the Chao Race.
E-102 "ƒÁ" (10) - Become friends with E-102.
Knuckles the Echidna (10) - Become friends with Knuckles.
The Adventurer (20) - Get all Emblems in the Adventure Field.
The Fastest & Strongest (20) - Get Level A on all the Action Stages.
Sonic the Hedgehog (10) - Clear the Sonic story.
Sub Game Master (20) - Get all Emblems of the Sub Games.
Super Sonic (20) - Clear all characters stories.
The Perfect Adventurer (40) - Get all 130 Emblems.

Unlock Avatar Awards
Vintage Sonic Tee - Play the game for 5 hours.
Sonic's Hi-Speed Shoes - Play the game for 10 hours.